<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model='isAll'/>
    </label>
    <span>
      <span>已完成 {{doneTotal}}</span> / 全部 {{todos.length}}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name:'NoteFooter',
  // props:['todos','checkedAllTodo','clearAllTodo'],
  props:['todos'],
  computed: {
    doneTotal(){
      let i = 0
      return this.todos.reduce((pre,current)=>{
        return pre + (current.finish?1:0)
      },0)
    },
    isAll:{
      get(){ return this.doneTotal === this.todos.length && this.todos.length>0 },
      set(value){  this.$emit('checkedAllTodo',value)},
    }
  },
  methods: {
    checkAll(event){
      this.$emit('checkedAllTodo',event.target.checked)
    },
    clearAll() {
      this.$emit('clearAllTodo')
    }
  },
}
</script>

<style scoped>
  /*footer*/
  .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }

  .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }

  .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }

  .todo-footer button {
    float: right;
    margin-top: 5px;
  }
</style>